If these nuts fail or are not torqued correctly, you will get an exhaust leak. An exhaust leak before the turbo will rob your engine of power and hurt fuel economy. A leak at the manifold will create a loud ticking noise and can allow dangerous fumes to enter the engine bay and potentially the cabin. Replacing these nuts whenever you are working on the exhaust system is a small price to pay for peace of mind.
ZD30
These are the nuts that are used for the exhaust manifold
TD42t
These are the nuts that go onto the studs to bolt the turbo exhaust housing to the exhaust manifold and the nuts for the exhaust manifold to cylinder head.
YD25
These are the nuts the hold the dump pipe to the turbo housing
Please check vehicle fitment to confirm compatibility with your vehicle. Please contact us with your VIN details if you require further assistance to confirm fitment.